Greetings from the Denver, Colorado USA area.
Here is my latest build:
Carbon Core 950 X-8, setup currently as a quad.
T-Motor TM3515-15 kv400 (x4)
14x4.7 props (x4)
Turnigy S6 8000mAh battery
ZTW A-Series 50 amp ESC (x4)
3DR APM 2.6
Tarot T-2d gimbal with GoPro Hero 3
Custom APM mounting (rubber o-ring isolation with memory foam (earplug) vibration damping. This was necessary in order to reduce vibrations to an acceptable level. I tried with out the damping, but it was still too sensitive.
I am currently getting 10+ minute flights
Stabilize is tight, and Loiter/Alt hold are rock solid. The only real change I made to the stock configuration was a decrease in rate roll P to .12 from the stock .15 to get rid of a slight oscillation. That was it, no other change. I suppose I could mess with additional tuning params, but to be honest, it flies really well the way it is.
The Compassmot was 11% as it stands (no additional work needed because the frame had a mount for the GPS built-in)
Vibrations in x-y axis are around +-2
Vibration in z are between -7.5 and -11.5
The kit itself was excellent. It is super light and very strong. I did find it a challenge to fit the ESC inside the frame, but they did fit eventually.
Based on some of the bench testing, I'm guessing this could lift 10lbs no problem. I'm already interested in adding the additional set of motors/props to see what it is capable of, but no need right now. It already hovers at about 1/3 throttle, so adding more power (and little extra weight) would make this thing quite overpowered. I'm not sure I need to lift the equivalent of a medium sized dog into the air, so I will probably keep this setup for a while.
If anyone has any questions, please feel free to ask!